From 3eb9e9701a10ef6fecf34fbdf1f8ccc8ae0bca11 Mon Sep 17 00:00:00 2001
From: Mathias Gumz <mg@2hoch5.com>
Date: Sun, 25 Sep 2016 09:11:21 +0200
Subject: [PATCH] improve feedback when no rolls are given

---
 main.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/main.go b/main.go
index 45df67b..e60e949 100644
--- a/main.go
+++ b/main.go
@@ -73,6 +73,11 @@ func main() {
 		return
 	}
 
+	if len(flag.Args()) == 0 {
+		fmt.Println("no rolls given, no lookup possible.\n")
+		flag.Usage()
+		return
+	}
 	doLookupRolls(flag.Args(), lines, printer)
 }